Dow-Key Microwave MS-1U18S-4 Manual do Operador descarregar pdf (Página 39)

Remote Operation

6.4.2 *OPC?

Syntax

*OPC?

Description

This query returns an ASCII character “1” when all pending operations have

been finished.

Result

ASCII character “1”.

Possible error codes

None

Example 1

*OPC?

Result

“1”

Example 2

:SWIT1 4; SWIT2 4; *OPC?

Result

“0”

Timing

In example 2 the matrix did not have the time to execute the command. Hence

a “0” is returned. A subsequent *OPC? will return a “1” as shown in example 1.

The timing to execute a command depends on the length of the command (in

case of concatenated commands).

As a rule of thumb electromechanical switches require approximately 30ms to

switch position. It is safe to consider some safety margin and increase this

timing to 40-50 ms when developing the control software.

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Dow-Key Microwave MS-1U18S-4 Manual do Operador Página 39